[Python] Remove --locked flag from uv sync in copilot-setup-steps.yml (#628)

* Initial plan

* Fix: remove --locked flag from uv sync in copilot-setup-steps.yml

The --locked flag requires a uv.lock file which doesn't exist in the
python/ directory, causing the "Install Python dependencies" setup step
to fail for CCA invocations. This aligns with the python-sdk-tests.yml
workflow which uses uv sync without --locked.

Co-authored-by: stephentoub <2642209+stephentoub@users.noreply.github.com>

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: stephentoub <2642209+stephentoub@users.noreply.github.com>

Author: Copilot

.github/workflows/copilot-setup-steps.yml

@@ -77,7 +77,7 @@ jobs:
       # Install Python dependencies
       - name: Install Python dependencies
         working-directory: ./python
-        run: uv sync --locked --all-extras --dev
+        run: uv sync --all-extras --dev
 
       # Install Go dependencies
       - name: Install Go dependencies